Houston-Galveston-Brazoria 8-Hour Ozone SIP Modeling (2000 Episode): MM5 Modeling Domain

Meteorological model MM5 modeling domain horizontal grid and vertical layer structures for the Houston-Galveston-Brazoria 8-hour ozone SIP (2000 episode).

Following are the MM5 horizontal grid and vertical layer structures used in the Houston-Galveston-Brazoria (HGB) eight-hour ozone SIP modeling.

Horizontal Grid Structure

The MM5 modeling domain is defined with the Lambert Conformal Conic map projection:

First True Latitude (Alpha):	30ºN
Second True Latitude (Beta):	60ºN
Central Longitude (Gamma):	100ºW
Projection Origin:	(100ºW, 40ºN)
Spheroid:	Perfect sphere, radius = 6370 km

The horizontal modeling domain grid structure consists of a coarse-grid continental domain and four nested subdomains: the Regional Domain, the East Texas Domain, the Houston-Galveston-Brazoria-Beaumont-Port Arthur (HGBPA) Domain, and the optional Houston-Galveston Bay (HG) Domain.

Domain	Range (km)		Number of Grid Points		Cell Size (km)
Domain	Easting	Northing	Easting	Northing	Easting	Northing
Continental	(-2808,2808)	(-2268,2268)	53	43	108	108
Regional	(-972,2160)	(-1728,972)	88	76	36	36
East Texas	(-72,1116)	(-1548,-360)	100	100	12	12
HGBPA	(216,816)	(-1356,-816)	151	136	4	4
HG	(424,520)	(-1156,-1076)	97	81	1	1

HGB SIP MCR MM5 Modeling Domain

Vertical Layer Structure

Layer	Sigma	Layer Top (m AGL)	Center (m AGL)	Thickness (m)
43	0.000	20806.8	20362.1	889.6
42	0.010	19917.3	19341.4	1151.7
41	0.025	18765.6	18117.9	1295.3
40	0.045	17470.3	16918.8	1103.1
39	0.065	16367.2	15773.2	1188.1
38	0.090	15179.1	14662.7	1032.8
37	0.115	14146.3	13602.4	1087.8
36	0.145	13058.5	12577.6	961.9
35	0.175	12096.6	11596.6	1000.0
34	0.210	11096.7	10587.9	1017.5
33	0.250	10079.1	9622.9	912.6
32	0.290	9166.6	8752.3	828.6
31	0.330	8338.0	7958.1	759.8
30	0.370	7578.2	7269.5	617.3
29	0.405	6960.9	6671.3	579.2
28	0.440	6381.7	6108.8	545.8
27	0.475	5835.9	5577.7	516.3
26	0.510	5319.5	5108.7	421.6
25	0.540	4898.0	4695.9	404.0
24	0.570	4493.9	4299.9	388.0
23	0.600	4105.9	3919.3	373.3
22	0.630	3732.7	3552.8	359.7
21	0.660	3373.0	3199.5	347.1
20	0.690	3025.9	2858.2	335.5
19	0.720	2690.4	2528.1	324.6
18	0.750	2365.8	2234.4	262.8
17	0.775	2103.0	1974.9	256.1
16	0.800	1846.9	1721.9	249.8
15	0.825	1597.0	1475.1	243.9
14	0.850	1353.2	1281.4	143.6
13	0.865	1209.6	1138.8	141.6
12	0.880	1068.0	998.1	139.7
11	0.895	928.3	859.4	137.8
10	0.910	790.5	745.0	90.9
9	0.920	699.6	654.6	90.1
8	0.930	609.5	564.9	89.3
7	0.940	520.2	476.0	88.5
6	0.950	431.7	387.8	87.8
5	0.960	343.9	300.4	87.0
4	0.970	256.9	213.7	86.3
3	0.980	170.5	127.7	85.6
2	0.990	84.9	59.4	51.0
1	0.996	33.9	16.9	33.9
0	1.000	0.0	0.0	0.0

Note: AGL = Above ground level.